The WQ440 meter is designed to measure conductivity in groundwater and surface water .
In accordance with the USEPA method 180.1 for turbidity measurement, the turbidity sensors are a 90 degree dispersion nephelometer .
The turbidity meter directs a focused beam of light into the monitored water. The light beam reflects on the particles in the water and the resulting light intensity is measured by the photoelectric detector of the turbidity sensor positioned at 90 degrees with respect to the light beam. The intensity of light detected by the turbidity sensor is directly proportional to the turbidity of the water. The turbidity sensors use a second light detector to correct for variations in intensity, color changes and small deposits on the lens.
Each sensor comes with a test certificate which certifies the results of the test performed and the electromechanical characteristics of the itself.